Optical film laminate used for continuous lamination to panel component

Abstract

To provide a continuous web of optical film laminate provided with static electrification prevention function which allows for promptly attenuating static charge of optical film sheet and carrier film electrified by peeling action in RTP lamination method and apparatus. The problem has been solved with a continuous web of optical film laminate for using in RTP lamination method and apparatus, in which static electrification prevention function is provided to optical film sheets and a carrier film configuring the continuous web of optical film laminate, such that sheet resistance of each of the optical film sheets and the carrier film is 1012 Ω / sq or less so as to promptly attenuate static charge of the carrier film to be collected, which is statically electrified by peeling action, and the optical film sheets to be laminated to panel components, which are also statically electrified by peeling action.

Description

TECHNICAL FIELD[0001]The present invention relates to a continuous web of optical film laminate to be used in a method and an apparatus for continuously manufacturing optical display devices by laminating optical film sheets to panel components (hereinafter referred as “RTP lamination method and apparatus”).[0002]More in particular, in RTP lamination method and apparatus for continuously manufacturing optical display devices by laminating optical film sheets via adhesive layer to panel components conveyed to a predetermined lamination position, when a carrier film which is laminated to an adhesive layer and configures a continuous web of optical film laminate is peeled from the adhesive layer, the peeled carrier film is statically electrified by peeling, which in turn causes inductive electrification on the panel components being conveyed to the predetermined lamination position. On the other hand, a surface of the adhesive layer peeled from the carrier film is also statically elect...

AI Technical Summary

Benefits of technology

The technical effect of this patent is to provide a continuous web of optical film laminate that can quickly reduce static electrification caused by peeling during the lamination process. This improves the quality and efficiency of manufacturing optical display devices by continuously laminating optical film sheets to panel components.

Problems solved by technology

It has been well known that static electricity of electrified optical display device can deteriorate or can even damage built-in electronic components.

Thus, a remaining problem is how to attenuate static charge of a polarizing film sheet including an adhesive layer statically electrified by peeling, before laminating to a liquid crystal panel.

More in particular, in RTP lamination method and apparatus, since a liquid crystal panel is conveyed to a predetermined lamination position in close vicinity of a peeled carrier film where a polarizing film sheet including an adhesive layer is laminated to the liquid crystal panel while being peeled from the carrier film, it is not possible to avoid effect of the carrier film and the polarizing film sheet that are statically electrified by peeling.

That is, at least two problems need to be solved to prevent static electrification of a liquid crystal panel in RTP lamination method and apparatus.

A first problem is to prevent inductive electrification of a liquid crystal panel induced by a carrier film, being conveyed in close vicinity of the carrier film which is statically electrified by peeling.

A second problem is how to address inductive electrification of the liquid crystal panel caused when laminating thereto a polarizing film sheet including an adhesive layer which is statically electrified while peeling from the carrier film.

If it is addressed incompletely, electronic components built-in an inductively-electrified liquid crystal panel may be damaged by static electricity, or even if not damaged, light leaking parts due to orientation disorder of liquid crystal may be found in an inspection process in a completed liquid crystal display device, as seen in a photograph in FIG. 2.

As a result, a transmission inspection of a liquid crystal display device as a product becomes difficult which in turn compromises continuous manufacturing of a liquid crystal display device.

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